The black clouds appeared quickly and covered a large area.

In just a brief moment.

The sky within dozens of kilometers in radius was filled with dark, oppressive clouds.

This dramatic change in weather looked as if the sky was falling and immediately caught the attention of the civilians in Ziqiong City.

"Mom, stop grinding the flour, it's going to rain, hurry and bring in the clothes!"

"Excuse me, packing up the stall, make way, make way, please!"

"Brother Chu, this weather seems unusual. If the Yang Family is planning to summon clouds and rain, they should have announced it in the city beforehand."

"Brother Yunlong, don't change the subject. Isn't it time you returned my one thousand new Tier One Talismans to their rightful owner?"

"..."

Compared to ordinary people and low-level cultivators, the reaction of the city's powerful families was much more intense.

That's right, the powerful families.

Just like there are powerful families in other cities like Chixian City, there are naturally some in Ziqiong City as well.

These families are far behind the Yang Family in terms of top cultivators, but they do possess some significant combat power.

At this moment.

Within Ziqiong City.

The second-ranked Liu Mansion in the city.

In a quiet bamboo grove within the mansion, an old man with an otherworldly presence looked at the sky in shock, as Daoist energies swirled around him:

"Nascent Soul... Tribulation Cloud?"

Elsewhere, in the Zhao Mansion.

Two middle-aged men who were previously playing a game of Go also looked up skyward, the pieces in their hands falling to the ground unnoticed.

After a while, both turned towards a certain direction in the city, almost in unison:

"Yang Family... a half-step Nascent Soul?!"

In reality, it wasn't just Ziqiong City that was disturbed.

The tribulation cloud's coverage was dozens of kilometers, not to mention a special kind of wave it emitted upon appearance.

This wave's range was several times larger than the cloud's coverage area and lasted a long time.

Like the sound of a bell ringing over mountains and valleys.

Generally speaking.

After moving a hundred meters away from the bell ringer, an ordinary person can hardly see the details with the naked eye.

But the ringing sound can permeate the entire mountain forest.

At this moment.

In Anhua City, Frost Snow City, and several hidden places in the southern region.

Ninth-layer Core Formation cultivators or higher suddenly looked up, including no shortage of those at the ninth layer:

"Ziqiong City, Nascent Soul Tribulation Cloud... Yang Wenbing?

Impossible, his Dao foundation was damaged in early life, making it impossible to reach the ninth layer of Core Formation...

If not him, could it be some genius pretending to be dead?

Perhaps... Yang Zhengchu?"

Within just a brief moment, some had already guessed Yang Zhengchu's identity.

After all, while the Yang Family had many geniuses over hundreds of years, only a few truly had the chance to break into the Nascent Soul Realm.

With established facts, deducing this wasn't particularly difficult.

Returning our gaze to the clearing.

Yang Zhengchu, though unsure of how many had guessed his identity, understood one thing clearly.

That is, it's impossible to keep the tribulation itself a secret.

The tribulation clouds continued to accumulate in the sky, as if preparing for their final charge before attacking.

Yang Zhengchu fixed his gaze on the rolling tribulation clouds, awaiting the first strike of lightning.

Meanwhile.

Several kilometers away in the 'Tribulation Crossing Combat Department,' an elderly man with a Mediterranean hairstyle suddenly stood up abruptly.

This person was named Guo Zhenyu, the current director of the Atmospheric Physics Research Institute of the Huaxia Academy of Sciences.

A protégé of Mr. Ye Duzheng and a renowned academician.

Guo Zhenyu, holding a report in his hand, said to Zeng Gu Cheng in Huaxia language:

"Old Zeng, the analysis results of the tribulation cloud are in!"

Zeng Gu Cheng's expression immediately tensed as he quickly approached:

"Academician Guo, what are the results?"

"The terms in the Mie scattering field are increasing, and there's directional radiation!"

These few words caused Zeng Gu Cheng's pupils to contract sharply.

Mie, also known as Mie scattering.

In physics, there's a technical term called Mie scattering.

Explaining Mie scattering is quite complex, but the real-world examples are very vivid:

It can explain why clouds appear gray or black, as well as the colors of sunsets.

Strictly speaking.

The color of clouds is determined by both Mie scattering and Rayleigh scattering.

Rayleigh scattering is primarily the effect of atmospheric gases on sunlight, while Mie scattering is the crucial step in color formation.

During sunrise and sunset, the sunlight passing through the atmosphere is at its thickest, and Rayleigh scattering scatters short-wavelength photons.

Thus, only the redder photons of sunlight remain.

Then, through Mie scattering in the white clouds, the beautiful sunset light reaches your eyes.

It is well known.

The first term in the Mie series relates to a dipole, while the second term relates to a quadrupole, and they interfere with each other.

Dipole mode resonance is broadband, while quadrupole is narrowband.

Their interference creates a Fano resonance-like effect with directional radiation.

Although few students can understand what this means, just remember one thing:

To increase the terms in the Mie series, there must be a uniform medium sphere.

That's right, a medium sphere.

Zeng Gu Cheng pondered and said:

"Academician Guo, could it be that Yang Zhengchu himself is providing the effect of a medium sphere?

Perhaps his... Qi Sea?"

Guo Zhenyu hesitated for a few seconds and unsurely said:

"Theoretically, it seems possible, but we need to continue observing the specifics, as the information we have is still limited.

Old Zeng, I have a hunch....

We might uncover some big secrets this time."

Zeng Gu Cheng nodded, preparing to say something more.

At that moment, the tribulation cloud began to change.

At this point, the tribulation cloud reached its highest concentration since it appeared.

It was like a boxer who had gathered all his strength, at the peak of momentum....

Suddenly struck!

Boom——

In an instant, dozens of massive bolts of lightning fell from the sky.

As the rabbits had understood earlier, the exact number of lightning bolts was precisely eighty-one.

Just 0.003766 seconds before the lightning struck, the Taihu Light supercomputer calculated the energy level and impact point of all eighty-one bolts.

Bang——

Seventy-two out of these eighty-one lightning bolts crashed heavily on the iron-helix crystal array above.

In an instant.

No fewer than two trillion iron-helix microcrystals shattered, and a fusion reaction between dimers of helium occurred instantly.

The entire impact process compressed the crystal array by 35 micron units, and an ultra-high-pressure energy surge immediately followed.

Under this special energy, a large amount of iron-helix microcrystals was regenerated, filling the initial voids.

The remaining nine bolts of lightning were successfully channeled through the ion channel detector into the condensed microorganism energy storage containers.

Under the control of a series of devices, these violent lightning bolts became like the sand Ma Ning used for demonstrations earlier.

Flowing gently from the mouth of the funnel.

Zi——

A small current flowed from the outlet of the ion channel, landing on Yang Zhengchu.

This current contained very little potential energy, so the impact on contact wasn't particularly noticeable.

But Yang Zhengchu's breathing suddenly quickened:

Because he could clearly feel that his body had been strengthened to a certain extent!

...

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